Effect of two-dimensional-Langevin and trap-assisted recombination on the device performance of organic solar cells

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Abstract

Using drift-diffusion simulations, we have clarified the effect of two-dimensional lamellar ordering on the device performance and, in particular, the open circuit voltage in donor-acceptor type organic solar cells. The simulations are performed both in systems where direct (band-to-band) recombination dominates and in systems where trap-assisted recombination dominates. Results show that lamellar ordering reduces both the amount of direct and trap-assisted recombination, which is beneficial for device performance. The effect is particularly prominent for small lamellar thicknesses (similar to 1 nm). It is furthermore shown that in the case of s-shaped current-voltage characteristics due to electrostatic injection barriers the s-shape becomes less prominent for thinner lamellar thicknesses.
Original languageUndefined/Unknown
Pages (from-to)
Number of pages9
JournalJournal of Photonics for Energy
Volume6
Issue number1
DOIs
Publication statusPublished - 2016
MoE publication typeA1 Journal article-refereed

Keywords

  • 2D drift-diffusion simulation
  • open circuit voltage
  • organic solar cells
  • recombination

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